In-situ immobilization of ZIF-67 on wood aerogel for effective removal of tetracycline from water

吸附 气凝胶 复合数 化学工程 朗缪尔吸附模型 材料科学 结晶度 吸热过程 化学 复合材料 有机化学 工程类
作者
Guanyu Chen,Song He,Guibin Shi,Yuansheng Ma,Chichi Ruan,Xin Jin,Qilin Chen,Xinyu Liu,Huaming Dai,Xianfeng Chen,Dongmei Huang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:423: 130184-130184 被引量:213
标识
DOI:10.1016/j.cej.2021.130184
摘要

Metal-organic framework (MOF) materials have been extensively studied in the removal of pollutants in wastewater. However, MOFs, which are usually in powder form, suffer from complex separation that hinder their practical application. Herein, a composite adsorbent material, [email protected] (wood aerogel), has been successfully fabricated through in-situ anchoring of ZIF-67 rhombic dodecahedron on the wood aerogel obtained by selectively removing lignin and hemicellulose from natural wood. WA with lamellar structure provided sufficient attachment sites for ZIF-67, and the content of ZIF-67 in the composite reached 32.65 wt%. ZIF-67 with 1 μm in grain size maintained its crystallinity when it was introduced to the surface of WA. The effects of pH, contact time, initial concentration, temperature, coexisting ions and humic acid on tetracycline (TC) adsorption were investigated. The composite showed excellent TC adsorption capacity (273.84 mg·g−1 at 298 K), which was comparable to most previously reported adsorbents. Pseudo-second-order kinetic model and Langmuir isotherm model described the adsorption process well. Adsorption thermodynamic studies implied that the adsorption process was spontaneous and endothermic. Furthermore, the possible adsorption mechanism was proposed. The TC removal efficiency dropped from 94.09% to 80.27% after 3 cycles, revealing the composite could be recycled. The leaching of cobalt was measured to be within the permissible range, indicating that no serious secondary contamination would be caused during using the composite. The superior adsorption performance coupled with compressibility, light weight and facile separation gave [email protected] the potential to effectively remove TC from water.
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